ffmpeg | branch: master | Clément Bœsch <u...@pkh.me> | Wed Mar 29 13:38:29 2017 +0200| [878070cc56065a6e0bc4aa2a73c6ac512bfa4d17] | committer: Clément Bœsch
Merge commit 'f5df897c4b61985e3afc89ba1290649712ff438e' * commit 'f5df897c4b61985e3afc89ba1290649712ff438e': examples/avcodec: split audio decoding into a separate example Merged-by: Clément Bœsch <u...@pkh.me> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=878070cc56065a6e0bc4aa2a73c6ac512bfa4d17 --- configure | 2 + doc/Makefile | 1 + doc/examples/.gitignore | 1 + doc/examples/Makefile | 1 + doc/examples/decode_audio.c | 151 +++++++++++++++++++++++++++++++++++++++ doc/examples/decoding_encoding.c | 108 ---------------------------- 6 files changed, 156 insertions(+), 108 deletions(-) diff --git a/configure b/configure index bf1d2fe..71a2734 100755 --- a/configure +++ b/configure @@ -1461,6 +1461,7 @@ COMPONENT_LIST=" EXAMPLE_LIST=" avio_dir_cmd_example avio_reading_example + decode_audio_example decoding_encoding_example demuxing_decoding_example encode_audio_example @@ -3168,6 +3169,7 @@ scale_vaapi_filter_deps="vaapi VAProcPipelineParameterBuffer" # examples avio_dir_cmd_deps="avformat avutil" avio_reading_deps="avformat avcodec avutil" +decode_audio_example_deps="avcodec avutil" decoding_encoding_example_deps="avcodec avformat avutil" demuxing_decoding_example_deps="avcodec avformat avutil" encode_audio_example_deps="avcodec avutil" diff --git a/doc/Makefile b/doc/Makefile index 396d9e0..d76139a 100644 --- a/doc/Makefile +++ b/doc/Makefile @@ -38,6 +38,7 @@ DOCS = $(DOCS-yes) DOC_EXAMPLES-$(CONFIG_AVIO_DIR_CMD_EXAMPLE) += avio_dir_cmd DOC_EXAMPLES-$(CONFIG_AVIO_READING_EXAMPLE) += avio_reading +DOC_EXAMPLES-$(CONFIG_DECODE_AUDIO_EXAMPLE) += decode_audio DOC_EXAMPLES-$(CONFIG_DECODING_ENCODING_EXAMPLE) += decoding_encoding DOC_EXAMPLES-$(CONFIG_DEMUXING_DECODING_EXAMPLE) += demuxing_decoding DOC_EXAMPLES-$(CONFIG_ENCODE_AUDIO_EXAMPLE) += encode_audio diff --git a/doc/examples/.gitignore b/doc/examples/.gitignore index 1a6209b..ee10e07 100644 --- a/doc/examples/.gitignore +++ b/doc/examples/.gitignore @@ -1,5 +1,6 @@ /avio_dir_cmd /avio_reading +/decode_audio /decoding_encoding /demuxing_decoding /encode_audio diff --git a/doc/examples/Makefile b/doc/examples/Makefile index f76e5a2..3f33c22 100644 --- a/doc/examples/Makefile +++ b/doc/examples/Makefile @@ -13,6 +13,7 @@ LDLIBS := $(shell pkg-config --libs $(FFMPEG_LIBS)) $(LDLIBS) EXAMPLES= avio_dir_cmd \ avio_reading \ + decode_audio \ decoding_encoding \ demuxing_decoding \ encode_audio \ diff --git a/doc/examples/decode_audio.c b/doc/examples/decode_audio.c new file mode 100644 index 0000000..738a188 --- /dev/null +++ b/doc/examples/decode_audio.c @@ -0,0 +1,151 @@ +/* + * Copyright (c) 2001 Fabrice Bellard + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +/** + * @file + * audio decoding with libavcodec API example + * + * @example decode_audio.c + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "libavcodec/avcodec.h" + +#include "libavutil/frame.h" + +#define AUDIO_INBUF_SIZE 20480 +#define AUDIO_REFILL_THRESH 4096 + +int main(int argc, char **argv) +{ + const char *outfilename, *filename; + AVCodec *codec; + AVCodecContext *c= NULL; + int len; + FILE *f, *outfile; + uint8_t inbuf[AUDIO_INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; + AVPacket avpkt; + AVFrame *decoded_frame = NULL; + + if (argc <= 2) { + fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]); + exit(0); + } + filename = argv[1]; + outfilename = argv[2]; + + /* register all the codecs */ + avcodec_register_all(); + + av_init_packet(&avpkt); + + /* find the MPEG audio decoder */ + codec = avcodec_find_decoder(AV_CODEC_ID_MP2); + if (!codec) { + fprintf(stderr, "Codec not found\n"); + exit(1); + } + + c = avcodec_alloc_context3(codec); + if (!c) { + fprintf(stderr, "Could not allocate audio codec context\n"); + exit(1); + } + + /* open it */ + if (avcodec_open2(c, codec, NULL) < 0) { + fprintf(stderr, "Could not open codec\n"); + exit(1); + } + + f = fopen(filename, "rb"); + if (!f) { + fprintf(stderr, "Could not open %s\n", filename); + exit(1); + } + outfile = fopen(outfilename, "wb"); + if (!outfile) { + av_free(c); + exit(1); + } + + /* decode until eof */ + avpkt.data = inbuf; + avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f); + + while (avpkt.size > 0) { + int i, ch; + int got_frame = 0; + + if (!decoded_frame) { + if (!(decoded_frame = av_frame_alloc())) { + fprintf(stderr, "Could not allocate audio frame\n"); + exit(1); + } + } + + len = avcodec_decode_audio4(c, decoded_frame, &got_frame, &avpkt); + if (len < 0) { + fprintf(stderr, "Error while decoding\n"); + exit(1); + } + if (got_frame) { + /* if a frame has been decoded, output it */ + int data_size = av_get_bytes_per_sample(c->sample_fmt); + if (data_size < 0) { + /* This should not occur, checking just for paranoia */ + fprintf(stderr, "Failed to calculate data size\n"); + exit(1); + } + for (i=0; i<decoded_frame->nb_samples; i++) + for (ch=0; ch<c->channels; ch++) + fwrite(decoded_frame->data[ch] + data_size*i, 1, data_size, outfile); + } + avpkt.size -= len; + avpkt.data += len; + avpkt.dts = + avpkt.pts = AV_NOPTS_VALUE; + if (avpkt.size < AUDIO_REFILL_THRESH) { + /* Refill the input buffer, to avoid trying to decode + * incomplete frames. Instead of this, one could also use + * a parser, or use a proper container format through + * libavformat. */ + memmove(inbuf, avpkt.data, avpkt.size); + avpkt.data = inbuf; + len = fread(avpkt.data + avpkt.size, 1, + AUDIO_INBUF_SIZE - avpkt.size, f); + if (len > 0) + avpkt.size += len; + } + } + + fclose(outfile); + fclose(f); + + avcodec_free_context(&c); + av_frame_free(&decoded_frame); + + return 0; +} diff --git a/doc/examples/decoding_encoding.c b/doc/examples/decoding_encoding.c index f863bdf..7ee4f77 100644 --- a/doc/examples/decoding_encoding.c +++ b/doc/examples/decoding_encoding.c @@ -41,112 +41,6 @@ #include <libavutil/samplefmt.h> #define INBUF_SIZE 4096 -#define AUDIO_INBUF_SIZE 20480 -#define AUDIO_REFILL_THRESH 4096 - -/* - * Audio decoding. - */ -static void audio_decode_example(const char *outfilename, const char *filename) -{ - AVCodec *codec; - AVCodecContext *c= NULL; - int len; - FILE *f, *outfile; - uint8_t inbuf[AUDIO_INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; - AVPacket avpkt; - AVFrame *decoded_frame = NULL; - - av_init_packet(&avpkt); - - printf("Decode audio file %s to %s\n", filename, outfilename); - - /* find the MPEG audio decoder */ - codec = avcodec_find_decoder(AV_CODEC_ID_MP2); - if (!codec) { - fprintf(stderr, "Codec not found\n"); - exit(1); - } - - c = avcodec_alloc_context3(codec); - if (!c) { - fprintf(stderr, "Could not allocate audio codec context\n"); - exit(1); - } - - /* open it */ - if (avcodec_open2(c, codec, NULL) < 0) { - fprintf(stderr, "Could not open codec\n"); - exit(1); - } - - f = fopen(filename, "rb"); - if (!f) { - fprintf(stderr, "Could not open %s\n", filename); - exit(1); - } - outfile = fopen(outfilename, "wb"); - if (!outfile) { - av_free(c); - exit(1); - } - - /* decode until eof */ - avpkt.data = inbuf; - avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f); - - while (avpkt.size > 0) { - int i, ch; - int got_frame = 0; - - if (!decoded_frame) { - if (!(decoded_frame = av_frame_alloc())) { - fprintf(stderr, "Could not allocate audio frame\n"); - exit(1); - } - } - - len = avcodec_decode_audio4(c, decoded_frame, &got_frame, &avpkt); - if (len < 0) { - fprintf(stderr, "Error while decoding\n"); - exit(1); - } - if (got_frame) { - /* if a frame has been decoded, output it */ - int data_size = av_get_bytes_per_sample(c->sample_fmt); - if (data_size < 0) { - /* This should not occur, checking just for paranoia */ - fprintf(stderr, "Failed to calculate data size\n"); - exit(1); - } - for (i=0; i<decoded_frame->nb_samples; i++) - for (ch=0; ch<c->channels; ch++) - fwrite(decoded_frame->data[ch] + data_size*i, 1, data_size, outfile); - } - avpkt.size -= len; - avpkt.data += len; - avpkt.dts = - avpkt.pts = AV_NOPTS_VALUE; - if (avpkt.size < AUDIO_REFILL_THRESH) { - /* Refill the input buffer, to avoid trying to decode - * incomplete frames. Instead of this, one could also use - * a parser, or use a proper container format through - * libavformat. */ - memmove(inbuf, avpkt.data, avpkt.size); - avpkt.data = inbuf; - len = fread(avpkt.data + avpkt.size, 1, - AUDIO_INBUF_SIZE - avpkt.size, f); - if (len > 0) - avpkt.size += len; - } - } - - fclose(outfile); - fclose(f); - - avcodec_free_context(&c); - av_frame_free(&decoded_frame); -} /* * Video encoding example @@ -454,8 +348,6 @@ int main(int argc, char **argv) if (!strcmp(output_type, "h264")) { video_encode_example("test.h264", AV_CODEC_ID_H264); - } else if (!strcmp(output_type, "mp2")) { - audio_decode_example("test.pcm", "test.mp2"); } else if (!strcmp(output_type, "mpg")) { video_encode_example("test.mpg", AV_CODEC_ID_MPEG1VIDEO); video_decode_example("test%02d.pgm", "test.mpg"); ====================================================================== diff --cc configure index bf1d2fe,b19e3e1..71a2734 --- a/configure +++ b/configure @@@ -1459,39 -1209,31 +1459,40 @@@ COMPONENT_LIST= " EXAMPLE_LIST=" - avcodec_example + avio_dir_cmd_example + avio_reading_example + decode_audio_example + decoding_encoding_example + demuxing_decoding_example encode_audio_example + extract_mvs_example filter_audio_example + filtering_audio_example + filtering_video_example + http_multiclient_example metadata_example - output_example + muxing_example qsvdec_example + remuxing_example + resampling_audio_example + scaling_video_example transcode_aac_example + transcoding_example " - -HWACCEL_LIBRARY_NONFREE_LIST=" - cuda - libnpp -" -HWACCEL_LIBRARY_LIST=" - $HWACCEL_LIBRARY_NONFREE_LIST - d3d11va - dxva2 - libmfx - mmal - nvenc - omx - vaapi - vda - vdpau +EXTERNAL_AUTODETECT_LIBRARY_LIST=" + bzlib + iconv + libxcb + libxcb_shm + libxcb_shape + libxcb_xfixes + lzma + schannel + sdl + sdl2 + securetransport + xlib + zlib " EXTERNAL_LIBRARY_GPL_LIST=" @@@ -3166,24 -2436,14 +3167,25 @@@ zscale_filter_deps="libzimg scale_vaapi_filter_deps="vaapi VAProcPipelineParameterBuffer" # examples -avcodec_example_deps="avcodec avutil" +avio_dir_cmd_deps="avformat avutil" +avio_reading_deps="avformat avcodec avutil" + decode_audio_example_deps="avcodec avutil" +decoding_encoding_example_deps="avcodec avformat avutil" +demuxing_decoding_example_deps="avcodec avformat avutil" encode_audio_example_deps="avcodec avutil" +extract_mvs_example_deps="avcodec avformat avutil" filter_audio_example_deps="avfilter avutil" +filtering_audio_example_deps="avfilter avcodec avformat avutil" +filtering_video_example_deps="avfilter avcodec avformat avutil" +http_multiclient_example_deps="avformat avutil fork" metadata_example_deps="avformat avutil" -output_example_deps="avcodec avformat avutil swscale" +muxing_example_deps="avcodec avformat avutil swscale" qsvdec_example_deps="avcodec avutil libmfx h264_qsv_decoder vaapi_x11" -transcode_aac_example_deps="avcodec avformat avresample" +remuxing_example_deps="avcodec avformat avutil" +resampling_audio_example_deps="avutil swresample" +scaling_video_example_deps="avutil swscale" +transcode_aac_example_deps="avcodec avformat swresample" +transcoding_example_deps="avfilter avcodec avformat avutil" # libraries, in linking order avcodec_deps="avutil" diff --cc doc/Makefile index 396d9e0,326bb12..d76139a --- a/doc/Makefile +++ b/doc/Makefile @@@ -27,43 -11,27 +27,44 @@@ HTMLPAGES = $(AVPROGS-yes:%=doc/%.htm doc/nut.html \ doc/platform.html \ -DOCS-$(CONFIG_POD2MAN) += $(MANPAGES) $(PODPAGES) -DOCS-$(CONFIG_TEXI2HTML) += $(HTMLPAGES) -DOCS = $(DOCS-yes) +TXTPAGES = doc/fate.txt \ -DOC_EXAMPLES-$(CONFIG_AVCODEC_EXAMPLE) += avcodec -DOC_EXAMPLES-$(CONFIG_DECODE_AUDIO_EXAMPLE) += decode_audio -DOC_EXAMPLES-$(CONFIG_ENCODE_AUDIO_EXAMPLE) += encode_audio -DOC_EXAMPLES-$(CONFIG_FILTER_AUDIO_EXAMPLE) += filter_audio -DOC_EXAMPLES-$(CONFIG_METADATA_EXAMPLE) += metadata -DOC_EXAMPLES-$(CONFIG_OUTPUT_EXAMPLE) += output -DOC_EXAMPLES-$(CONFIG_QSVDEC_EXAMPLE) += qsvdec -DOC_EXAMPLES-$(CONFIG_TRANSCODE_AAC_EXAMPLE) += transcode_aac -ALL_DOC_EXAMPLES = avcodec decode_audio encode_audio filter_audio metadata \ - output transcode_aac -DOC_EXAMPLES := $(DOC_EXAMPLES-yes:%=doc/examples/%$(EXESUF)) -ALL_DOC_EXAMPLES := $(ALL_DOC_EXAMPLES:%=doc/examples/%$(EXESUF)) -PROGS += $(DOC_EXAMPLES) +DOCS-$(CONFIG_HTMLPAGES) += $(HTMLPAGES) +DOCS-$(CONFIG_PODPAGES) += $(PODPAGES) +DOCS-$(CONFIG_MANPAGES) += $(MANPAGES) +DOCS-$(CONFIG_TXTPAGES) += $(TXTPAGES) +DOCS = $(DOCS-yes) -all: $(DOCS) +DOC_EXAMPLES-$(CONFIG_AVIO_DIR_CMD_EXAMPLE) += avio_dir_cmd +DOC_EXAMPLES-$(CONFIG_AVIO_READING_EXAMPLE) += avio_reading ++DOC_EXAMPLES-$(CONFIG_DECODE_AUDIO_EXAMPLE) += decode_audio +DOC_EXAMPLES-$(CONFIG_DECODING_ENCODING_EXAMPLE) += decoding_encoding +DOC_EXAMPLES-$(CONFIG_DEMUXING_DECODING_EXAMPLE) += demuxing_decoding +DOC_EXAMPLES-$(CONFIG_ENCODE_AUDIO_EXAMPLE) += encode_audio +DOC_EXAMPLES-$(CONFIG_EXTRACT_MVS_EXAMPLE) += extract_mvs +DOC_EXAMPLES-$(CONFIG_FILTER_AUDIO_EXAMPLE) += filter_audio +DOC_EXAMPLES-$(CONFIG_FILTERING_AUDIO_EXAMPLE) += filtering_audio +DOC_EXAMPLES-$(CONFIG_FILTERING_VIDEO_EXAMPLE) += filtering_video +DOC_EXAMPLES-$(CONFIG_HTTP_MULTICLIENT_EXAMPLE) += http_multiclient +DOC_EXAMPLES-$(CONFIG_METADATA_EXAMPLE) += metadata +DOC_EXAMPLES-$(CONFIG_MUXING_EXAMPLE) += muxing +DOC_EXAMPLES-$(CONFIG_QSVDEC_EXAMPLE) += qsvdec +DOC_EXAMPLES-$(CONFIG_REMUXING_EXAMPLE) += remuxing +DOC_EXAMPLES-$(CONFIG_RESAMPLING_AUDIO_EXAMPLE) += resampling_audio +DOC_EXAMPLES-$(CONFIG_SCALING_VIDEO_EXAMPLE) += scaling_video +DOC_EXAMPLES-$(CONFIG_TRANSCODE_AAC_EXAMPLE) += transcode_aac +DOC_EXAMPLES-$(CONFIG_TRANSCODING_EXAMPLE) += transcoding +ALL_DOC_EXAMPLES_LIST = $(DOC_EXAMPLES-) $(DOC_EXAMPLES-yes) + +DOC_EXAMPLES := $(DOC_EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)$(EXESUF)) +ALL_DOC_EXAMPLES := $(ALL_DOC_EXAMPLES_LIST:%=doc/examples/%$(PROGSSUF)$(EXESUF)) +ALL_DOC_EXAMPLES_G := $(ALL_DOC_EXAMPLES_LIST:%=doc/examples/%$(PROGSSUF)_g$(EXESUF)) +PROGS += $(DOC_EXAMPLES) + +all-$(CONFIG_DOC): doc + +doc: documentation apidoc: doc/doxy/html documentation: $(DOCS) diff --cc doc/examples/.gitignore index 1a6209b,3f60af7..ee10e07 --- a/doc/examples/.gitignore +++ b/doc/examples/.gitignore @@@ -1,19 -1,5 +1,20 @@@ -/avcodec +/avio_dir_cmd +/avio_reading ++/decode_audio +/decoding_encoding +/demuxing_decoding +/encode_audio +/extract_mvs /filter_audio +/filtering_audio +/filtering_video +/http_multiclient /metadata -/output +/muxing +/pc-uninstalled +/qsvdec +/remuxing +/resampling_audio +/scaling_video /transcode_aac +/transcoding diff --cc doc/examples/Makefile index f76e5a2,0000000..3f33c22 mode 100644,000000..100644 --- a/doc/examples/Makefile +++ b/doc/examples/Makefile @@@ -1,47 -1,0 +1,48 @@@ +# use pkg-config for getting CFLAGS and LDLIBS +FFMPEG_LIBS= libavdevice \ + libavformat \ + libavfilter \ + libavcodec \ + libswresample \ + libswscale \ + libavutil \ + +CFLAGS += -Wall -g +CFLAGS := $(shell pkg-config --cflags $(FFMPEG_LIBS)) $(CFLAGS) +LDLIBS := $(shell pkg-config --libs $(FFMPEG_LIBS)) $(LDLIBS) + +EXAMPLES= avio_dir_cmd \ + avio_reading \ ++ decode_audio \ + decoding_encoding \ + demuxing_decoding \ + encode_audio \ + extract_mvs \ + filtering_video \ + filtering_audio \ + http_multiclient \ + metadata \ + muxing \ + remuxing \ + resampling_audio \ + scaling_video \ + transcode_aac \ + transcoding \ + +OBJS=$(addsuffix .o,$(EXAMPLES)) + +# the following examples make explicit use of the math library +avcodec: LDLIBS += -lm +encode_audio: LDLIBS += -lm +muxing: LDLIBS += -lm +resampling_audio: LDLIBS += -lm + +.phony: all clean-test clean + +all: $(OBJS) $(EXAMPLES) + +clean-test: + $(RM) test*.pgm test.h264 test.mp2 test.sw test.mpg + +clean: clean-test + $(RM) $(EXAMPLES) $(OBJS) diff --cc doc/examples/decode_audio.c index 0000000,4378281..738a188 mode 000000,100644..100644 --- a/doc/examples/decode_audio.c +++ b/doc/examples/decode_audio.c @@@ -1,0 -1,137 +1,151 @@@ + /* - * copyright (c) 2001 Fabrice Bellard ++ * Copyright (c) 2001 Fabrice Bellard + * - * This file is part of Libav. ++ * Permission is hereby granted, free of charge, to any person obtaining a copy ++ * of this software and associated documentation files (the "Software"), to deal ++ * in the Software without restriction, including without limitation the rights ++ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ++ * copies of the Software, and to permit persons to whom the Software is ++ * furnished to do so, subject to the following conditions: + * - * Libav is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. ++ * The above copyright notice and this permission notice shall be included in ++ * all copies or substantial portions of the Software. + * - * Libav is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA ++ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ++ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ++ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL ++ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER ++ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, ++ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN ++ * THE SOFTWARE. + */ + + /** + * @file + * audio decoding with libavcodec API example + * + * @example decode_audio.c + */ + + #include <stdio.h> + #include <stdlib.h> + #include <string.h> + + #include "libavcodec/avcodec.h" + + #include "libavutil/frame.h" + + #define AUDIO_INBUF_SIZE 20480 + #define AUDIO_REFILL_THRESH 4096 + + int main(int argc, char **argv) + { + const char *outfilename, *filename; + AVCodec *codec; + AVCodecContext *c= NULL; + int len; + FILE *f, *outfile; + uint8_t inbuf[AUDIO_INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; + AVPacket avpkt; + AVFrame *decoded_frame = NULL; + + if (argc <= 2) { + fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]); + exit(0); + } + filename = argv[1]; + outfilename = argv[2]; + + /* register all the codecs */ + avcodec_register_all(); + + av_init_packet(&avpkt); + + /* find the MPEG audio decoder */ + codec = avcodec_find_decoder(AV_CODEC_ID_MP2); + if (!codec) { - fprintf(stderr, "codec not found\n"); ++ fprintf(stderr, "Codec not found\n"); + exit(1); + } + + c = avcodec_alloc_context3(codec); ++ if (!c) { ++ fprintf(stderr, "Could not allocate audio codec context\n"); ++ exit(1); ++ } + + /* open it */ + if (avcodec_open2(c, codec, NULL) < 0) { - fprintf(stderr, "could not open codec\n"); ++ fprintf(stderr, "Could not open codec\n"); + exit(1); + } + + f = fopen(filename, "rb"); + if (!f) { - fprintf(stderr, "could not open %s\n", filename); ++ fprintf(stderr, "Could not open %s\n", filename); + exit(1); + } + outfile = fopen(outfilename, "wb"); + if (!outfile) { + av_free(c); + exit(1); + } + + /* decode until eof */ + avpkt.data = inbuf; + avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f); + + while (avpkt.size > 0) { ++ int i, ch; + int got_frame = 0; + + if (!decoded_frame) { + if (!(decoded_frame = av_frame_alloc())) { - fprintf(stderr, "out of memory\n"); ++ fprintf(stderr, "Could not allocate audio frame\n"); + exit(1); + } + } + + len = avcodec_decode_audio4(c, decoded_frame, &got_frame, &avpkt); + if (len < 0) { + fprintf(stderr, "Error while decoding\n"); + exit(1); + } + if (got_frame) { + /* if a frame has been decoded, output it */ - int data_size = av_samples_get_buffer_size(NULL, c->channels, - decoded_frame->nb_samples, - c->sample_fmt, 1); - fwrite(decoded_frame->data[0], 1, data_size, outfile); ++ int data_size = av_get_bytes_per_sample(c->sample_fmt); ++ if (data_size < 0) { ++ /* This should not occur, checking just for paranoia */ ++ fprintf(stderr, "Failed to calculate data size\n"); ++ exit(1); ++ } ++ for (i=0; i<decoded_frame->nb_samples; i++) ++ for (ch=0; ch<c->channels; ch++) ++ fwrite(decoded_frame->data[ch] + data_size*i, 1, data_size, outfile); + } + avpkt.size -= len; + avpkt.data += len; ++ avpkt.dts = ++ avpkt.pts = AV_NOPTS_VALUE; + if (avpkt.size < AUDIO_REFILL_THRESH) { + /* Refill the input buffer, to avoid trying to decode + * incomplete frames. Instead of this, one could also use + * a parser, or use a proper container format through + * libavformat. */ + memmove(inbuf, avpkt.data, avpkt.size); + avpkt.data = inbuf; + len = fread(avpkt.data + avpkt.size, 1, + AUDIO_INBUF_SIZE - avpkt.size, f); + if (len > 0) + avpkt.size += len; + } + } + + fclose(outfile); + fclose(f); + + avcodec_free_context(&c); + av_frame_free(&decoded_frame); + + return 0; + } diff --cc doc/examples/decoding_encoding.c index f863bdf,0000000..7ee4f77 mode 100644,000000..100644 --- a/doc/examples/decoding_encoding.c +++ b/doc/examples/decoding_encoding.c @@@ -1,469 -1,0 +1,361 @@@ +/* + * Copyright (c) 2001 Fabrice Bellard + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +/** + * @file + * libavcodec API use example. + * + * @example decoding_encoding.c + * Note that libavcodec only handles codecs (MPEG, MPEG-4, etc...), + * not file formats (AVI, VOB, MP4, MOV, MKV, MXF, FLV, MPEG-TS, MPEG-PS, etc...). + * See library 'libavformat' for the format handling + */ + +#include <math.h> + +#include <libavutil/opt.h> +#include <libavcodec/avcodec.h> +#include <libavutil/channel_layout.h> +#include <libavutil/common.h> +#include <libavutil/imgutils.h> +#include <libavutil/mathematics.h> +#include <libavutil/samplefmt.h> + +#define INBUF_SIZE 4096 - #define AUDIO_INBUF_SIZE 20480 - #define AUDIO_REFILL_THRESH 4096 - - /* - * Audio decoding. - */ - static void audio_decode_example(const char *outfilename, const char *filename) - { - AVCodec *codec; - AVCodecContext *c= NULL; - int len; - FILE *f, *outfile; - uint8_t inbuf[AUDIO_INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; - AVPacket avpkt; - AVFrame *decoded_frame = NULL; - - av_init_packet(&avpkt); - - printf("Decode audio file %s to %s\n", filename, outfilename); - - /* find the MPEG audio decoder */ - codec = avcodec_find_decoder(AV_CODEC_ID_MP2); - if (!codec) { - fprintf(stderr, "Codec not found\n"); - exit(1); - } - - c = avcodec_alloc_context3(codec); - if (!c) { - fprintf(stderr, "Could not allocate audio codec context\n"); - exit(1); - } - - /* open it */ - if (avcodec_open2(c, codec, NULL) < 0) { - fprintf(stderr, "Could not open codec\n"); - exit(1); - } - - f = fopen(filename, "rb"); - if (!f) { - fprintf(stderr, "Could not open %s\n", filename); - exit(1); - } - outfile = fopen(outfilename, "wb"); - if (!outfile) { - av_free(c); - exit(1); - } - - /* decode until eof */ - avpkt.data = inbuf; - avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f); - - while (avpkt.size > 0) { - int i, ch; - int got_frame = 0; - - if (!decoded_frame) { - if (!(decoded_frame = av_frame_alloc())) { - fprintf(stderr, "Could not allocate audio frame\n"); - exit(1); - } - } - - len = avcodec_decode_audio4(c, decoded_frame, &got_frame, &avpkt); - if (len < 0) { - fprintf(stderr, "Error while decoding\n"); - exit(1); - } - if (got_frame) { - /* if a frame has been decoded, output it */ - int data_size = av_get_bytes_per_sample(c->sample_fmt); - if (data_size < 0) { - /* This should not occur, checking just for paranoia */ - fprintf(stderr, "Failed to calculate data size\n"); - exit(1); - } - for (i=0; i<decoded_frame->nb_samples; i++) - for (ch=0; ch<c->channels; ch++) - fwrite(decoded_frame->data[ch] + data_size*i, 1, data_size, outfile); - } - avpkt.size -= len; - avpkt.data += len; - avpkt.dts = - avpkt.pts = AV_NOPTS_VALUE; - if (avpkt.size < AUDIO_REFILL_THRESH) { - /* Refill the input buffer, to avoid trying to decode - * incomplete frames. Instead of this, one could also use - * a parser, or use a proper container format through - * libavformat. */ - memmove(inbuf, avpkt.data, avpkt.size); - avpkt.data = inbuf; - len = fread(avpkt.data + avpkt.size, 1, - AUDIO_INBUF_SIZE - avpkt.size, f); - if (len > 0) - avpkt.size += len; - } - } - - fclose(outfile); - fclose(f); - - avcodec_free_context(&c); - av_frame_free(&decoded_frame); - } + +/* + * Video encoding example + */ +static void video_encode_example(const char *filename, int codec_id) +{ + AVCodec *codec; + AVCodecContext *c= NULL; + int i, ret, x, y, got_output; + FILE *f; + AVFrame *frame; + AVPacket pkt; + uint8_t endcode[] = { 0, 0, 1, 0xb7 }; + + printf("Encode video file %s\n", filename); + + /* find the video encoder */ + codec = avcodec_find_encoder(codec_id); + if (!codec) { + fprintf(stderr, "Codec not found\n"); + exit(1); + } + + c = avcodec_alloc_context3(codec); + if (!c) { + fprintf(stderr, "Could not allocate video codec context\n"); + exit(1); + } + + /* put sample parameters */ + c->bit_rate = 400000; + /* resolution must be a multiple of two */ + c->width = 352; + c->height = 288; + /* frames per second */ + c->time_base = (AVRational){1,25}; + /* emit one intra frame every ten frames + * check frame pict_type before passing frame + * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I + * then gop_size is ignored and the output of encoder + * will always be I frame irrespective to gop_size + */ + c->gop_size = 10; + c->max_b_frames = 1; + c->pix_fmt = AV_PIX_FMT_YUV420P; + + if (codec_id == AV_CODEC_ID_H264) + av_opt_set(c->priv_data, "preset", "slow", 0); + + /* open it */ + if (avcodec_open2(c, codec, NULL) < 0) { + fprintf(stderr, "Could not open codec\n"); + exit(1); + } + + f = fopen(filename, "wb"); + if (!f) { + fprintf(stderr, "Could not open %s\n", filename); + exit(1); + } + + frame = av_frame_alloc(); + if (!frame) { + fprintf(stderr, "Could not allocate video frame\n"); + exit(1); + } + frame->format = c->pix_fmt; + frame->width = c->width; + frame->height = c->height; + + /* the image can be allocated by any means and av_image_alloc() is + * just the most convenient way if av_malloc() is to be used */ + ret = av_image_alloc(frame->data, frame->linesize, c->width, c->height, + c->pix_fmt, 32); + if (ret < 0) { + fprintf(stderr, "Could not allocate raw picture buffer\n"); + exit(1); + } + + /* encode 1 second of video */ + for (i = 0; i < 25; i++) { + av_init_packet(&pkt); + pkt.data = NULL; // packet data will be allocated by the encoder + pkt.size = 0; + + fflush(stdout); + /* prepare a dummy image */ + /* Y */ + for (y = 0; y < c->height; y++) { + for (x = 0; x < c->width; x++) { + frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3; + } + } + + /* Cb and Cr */ + for (y = 0; y < c->height/2; y++) { + for (x = 0; x < c->width/2; x++) { + frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2; + frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5; + } + } + + frame->pts = i; + + /* encode the image */ + ret = avcodec_encode_video2(c, &pkt, frame, &got_output); + if (ret < 0) { + fprintf(stderr, "Error encoding frame\n"); + exit(1); + } + + if (got_output) { + printf("Write frame %3d (size=%5d)\n", i, pkt.size); + fwrite(pkt.data, 1, pkt.size, f); + av_packet_unref(&pkt); + } + } + + /* get the delayed frames */ + for (got_output = 1; got_output; i++) { + fflush(stdout); + + ret = avcodec_encode_video2(c, &pkt, NULL, &got_output); + if (ret < 0) { + fprintf(stderr, "Error encoding frame\n"); + exit(1); + } + + if (got_output) { + printf("Write frame %3d (size=%5d)\n", i, pkt.size); + fwrite(pkt.data, 1, pkt.size, f); + av_packet_unref(&pkt); + } + } + + /* add sequence end code to have a real MPEG file */ + fwrite(endcode, 1, sizeof(endcode), f); + fclose(f); + + avcodec_free_context(&c); + av_freep(&frame->data[0]); + av_frame_free(&frame); + printf("\n"); +} + +/* + * Video decoding example + */ + +static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize, + char *filename) +{ + FILE *f; + int i; + + f = fopen(filename,"w"); + fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255); + for (i = 0; i < ysize; i++) + fwrite(buf + i * wrap, 1, xsize, f); + fclose(f); +} + +static int decode_write_frame(const char *outfilename, AVCodecContext *avctx, + AVFrame *frame, int *frame_count, AVPacket *pkt, int last) +{ + int len, got_frame; + char buf[1024]; + + len = avcodec_decode_video2(avctx, frame, &got_frame, pkt); + if (len < 0) { + fprintf(stderr, "Error while decoding frame %d\n", *frame_count); + return len; + } + if (got_frame) { + printf("Saving %sframe %3d\n", last ? "last " : "", *frame_count); + fflush(stdout); + + /* the picture is allocated by the decoder, no need to free it */ + snprintf(buf, sizeof(buf), outfilename, *frame_count); + pgm_save(frame->data[0], frame->linesize[0], + frame->width, frame->height, buf); + (*frame_count)++; + } + if (pkt->data) { + pkt->size -= len; + pkt->data += len; + } + return 0; +} + +static void video_decode_example(const char *outfilename, const char *filename) +{ + AVCodec *codec; + AVCodecContext *c= NULL; + int frame_count; + FILE *f; + AVFrame *frame; + uint8_t inbuf[INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; + AVPacket avpkt; + + av_init_packet(&avpkt); + + /* set end of buffer to 0 (this ensures that no overreading happens for damaged MPEG streams) */ + memset(inbuf + INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE); + + printf("Decode video file %s to %s\n", filename, outfilename); + + /* find the MPEG-1 video decoder */ + codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO); + if (!codec) { + fprintf(stderr, "Codec not found\n"); + exit(1); + } + + c = avcodec_alloc_context3(codec); + if (!c) { + fprintf(stderr, "Could not allocate video codec context\n"); + exit(1); + } + + if (codec->capabilities & AV_CODEC_CAP_TRUNCATED) + c->flags |= AV_CODEC_FLAG_TRUNCATED; // we do not send complete frames + + /* For some codecs, such as msmpeg4 and mpeg4, width and height + MUST be initialized there because this information is not + available in the bitstream. */ + + /* open it */ + if (avcodec_open2(c, codec, NULL) < 0) { + fprintf(stderr, "Could not open codec\n"); + exit(1); + } + + f = fopen(filename, "rb"); + if (!f) { + fprintf(stderr, "Could not open %s\n", filename); + exit(1); + } + + frame = av_frame_alloc(); + if (!frame) { + fprintf(stderr, "Could not allocate video frame\n"); + exit(1); + } + + frame_count = 0; + for (;;) { + avpkt.size = fread(inbuf, 1, INBUF_SIZE, f); + if (avpkt.size == 0) + break; + + /* NOTE1: some codecs are stream based (mpegvideo, mpegaudio) + and this is the only method to use them because you cannot + know the compressed data size before analysing it. + + BUT some other codecs (msmpeg4, mpeg4) are inherently frame + based, so you must call them with all the data for one + frame exactly. You must also initialize 'width' and + 'height' before initializing them. */ + + /* NOTE2: some codecs allow the raw parameters (frame size, + sample rate) to be changed at any frame. We handle this, so + you should also take care of it */ + + /* here, we use a stream based decoder (mpeg1video), so we + feed decoder and see if it could decode a frame */ + avpkt.data = inbuf; + while (avpkt.size > 0) + if (decode_write_frame(outfilename, c, frame, &frame_count, &avpkt, 0) < 0) + exit(1); + } + + /* Some codecs, such as MPEG, transmit the I- and P-frame with a + latency of one frame. You must do the following to have a + chance to get the last frame of the video. */ + avpkt.data = NULL; + avpkt.size = 0; + decode_write_frame(outfilename, c, frame, &frame_count, &avpkt, 1); + + fclose(f); + + avcodec_free_context(&c); + av_frame_free(&frame); + printf("\n"); +} + +int main(int argc, char **argv) +{ + const char *output_type; + + /* register all the codecs */ + avcodec_register_all(); + + if (argc < 2) { + printf("usage: %s output_type\n" + "API example program to decode/encode a media stream with libavcodec.\n" + "This program generates a synthetic stream and encodes it to a file\n" + "named test.h264, test.mp2 or test.mpg depending on output_type.\n" + "The encoded stream is then decoded and written to a raw data output.\n" + "output_type must be chosen between 'h264', 'mp2', 'mpg'.\n", + argv[0]); + return 1; + } + output_type = argv[1]; + + if (!strcmp(output_type, "h264")) { + video_encode_example("test.h264", AV_CODEC_ID_H264); - } else if (!strcmp(output_type, "mp2")) { - audio_decode_example("test.pcm", "test.mp2"); + } else if (!strcmp(output_type, "mpg")) { + video_encode_example("test.mpg", AV_CODEC_ID_MPEG1VIDEO); + video_decode_example("test%02d.pgm", "test.mpg"); + } else { + fprintf(stderr, "Invalid output type '%s', choose between 'h264', 'mp2', or 'mpg'\n", + output_type); + return 1; + } + + return 0; +} _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
