[FFmpeg-devel] [PATCH]Allow easy png streamcopying

[Carl Eugen Hoyos]

Hi!

Stream-copying png is currently too difficult.
An alternative is to remove the extension from the apng muxer.

Please comment, Carl Eugen

diff --git a/libavformat/apngenc.c b/libavformat/apngenc.c
index 4b31309..9090f92 100644
--- a/libavformat/apngenc.c
+++ b/libavformat/apngenc.c
@@ -23,6 +23,7 @@
 
 #include "avformat.h"
 #include "internal.h"
+#include "rawenc.h"
 #include "libavutil/avassert.h"
 #include "libavutil/crc.h"
 #include "libavutil/intreadwrite.h"
@@ -81,11 +82,14 @@ static int apng_write_header(AVFormatContext 
*format_context)
 
     if (format_context->nb_streams != 1 ||
         format_context->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO ||
-        format_context->streams[0]->codec->codec_id   != AV_CODEC_ID_APNG) {
+        format_context->streams[0]->codec->codec_id   != AV_CODEC_ID_APNG &&
+        format_context->streams[0]->codec->codec_id   != AV_CODEC_ID_PNG) {
         av_log(format_context, AV_LOG_ERROR,
-               "APNG muxer supports only a single video APNG stream.\n");
+               "APNG muxer supports only a single video (A)PNG stream.\n");
         return AVERROR(EINVAL);
     }
+    if (format_context->streams[0]->codec->codec_id == AV_CODEC_ID_PNG)
+        return 0;
 
     if (apng->last_delay.num > USHRT_MAX || apng->last_delay.den > USHRT_MAX) {
         av_reduce(&apng->last_delay.num, &apng->last_delay.den,
@@ -201,6 +205,9 @@ static int apng_write_packet(AVFormatContext 
*format_context, AVPacket *packet)
 {
     APNGMuxContext *apng = format_context->priv_data;
 
+    if (format_context->streams[0]->codec->codec_id == AV_CODEC_ID_PNG)
+        return ff_raw_write_packet(format_context, packet);
+
     if (!apng->prev_packet) {
         apng->prev_packet = av_malloc(sizeof(*apng->prev_packet));
         if (!apng->prev_packet)
@@ -220,6 +227,9 @@ static int apng_write_trailer(AVFormatContext 
*format_context)
     AVIOContext *io_context = format_context->pb;
     uint8_t buf[8];
 
+    if (format_context->streams[0]->codec->codec_id == AV_CODEC_ID_PNG)
+        return 0;
+
     if (apng->prev_packet) {
         flush_packet(format_context, NULL);
         av_freep(&apng->prev_packet);

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