Just for fun, here is an experimental patch that makes use of palette
side data packets if they exist. I suppose the packets (including side
data packets) will be unaltered from demuxing to muxing when using
stream copy, right? In any case, it produces flickering output for some
reason.
Mats
--
Mats Peterson
http://matsp888.no-ip.org/~mats/
>From 15dbacd20db011ebb3255aa2023e6132af56c0a6 Mon Sep 17 00:00:00 2001
From: Mats Peterson <matsp...@yahoo.com>
Date: Sat, 27 Feb 2016 22:33:29 +0100
Subject: [PATCH] lavf/avienc: Use palette side data packet if available
---
libavformat/avienc.c | 59 ++++++++++++++++++++++++++++++--------------------
1 file changed, 36 insertions(+), 23 deletions(-)
diff --git a/libavformat/avienc.c b/libavformat/avienc.c
index ca505f4..c1d26c2 100644
--- a/libavformat/avienc.c
+++ b/libavformat/avienc.c
@@ -671,36 +671,49 @@ static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
if (enc->codec_id == AV_CODEC_ID_RAWVIDEO && enc->codec_tag == 0) {
int64_t bpc = enc->bits_per_coded_sample != 15 ? enc->bits_per_coded_sample : 16;
int expected_stride = ((enc->width * bpc + 31) >> 5)*4;
+ const uint8_t *pal = NULL;
+ int pal_size = 1 << enc->bits_per_coded_sample;
+ int i;
ret = ff_reshuffle_raw_rgb(s, &pkt, enc, expected_stride);
if (ret < 0)
return ret;
- if (ret) {
- if (ret == CONTAINS_PAL) {
- int pc_tag, i;
- int pal_size = 1 << enc->bits_per_coded_sample;
- if (!avist->hdr_pal_done) {
- int64_t cur_offset = avio_tell(pb);
- avio_seek(pb, avist->pal_offset, SEEK_SET);
- for (i = 0; i < pal_size; i++) {
- uint32_t v = AV_RL32(data + size - 4*pal_size + 4*i);
- avio_wl32(pb, v & 0xffffff);
- }
- avio_seek(pb, cur_offset, SEEK_SET);
- avist->hdr_pal_done++;
- }
- avi_stream2fourcc(tag, stream_index, enc->codec_type);
- tag[2] = 'p'; tag[3] = 'c';
- pc_tag = ff_start_tag(pb, tag);
- avio_w8(pb, 0);
- avio_w8(pb, pal_size & 0xFF);
- avio_wl16(pb, 0); // reserved
+
+ for (i = 0; i < pkt->side_data_elems; i++) {
+ if (pkt->side_data[i].type == AV_PKT_DATA_PALETTE) {
+ pal = pkt->side_data[i].data;
+ break;
+ }
+ }
+ if (!pal && ret == CONTAINS_PAL)
+ pal = data + size - AVPALETTE_SIZE;
+
+ if (pal) {
+ int pc_tag, i;
+ if (!avist->hdr_pal_done) {
+ int64_t cur_offset = avio_tell(pb);
+ avio_seek(pb, avist->pal_offset, SEEK_SET);
for (i = 0; i < pal_size; i++) {
- uint32_t v = AV_RL32(data + size - 4*pal_size + 4*i);
- avio_wb32(pb, v<<8);
+ uint32_t v = AV_RL32(pal + 4*i);
+ avio_wl32(pb, v & 0xffffff);
}
- ff_end_tag(pb, pc_tag);
+ avio_seek(pb, cur_offset, SEEK_SET);
+ avist->hdr_pal_done++;
+ }
+ avi_stream2fourcc(tag, stream_index, enc->codec_type);
+ tag[2] = 'p'; tag[3] = 'c';
+ pc_tag = ff_start_tag(pb, tag);
+ avio_w8(pb, 0);
+ avio_w8(pb, pal_size & 0xFF);
+ avio_wl16(pb, 0); // reserved
+ for (i = 0; i < pal_size; i++) {
+ uint32_t v = AV_RL32(pal + 4*i);
+ avio_wb32(pb, v<<8);
}
+ ff_end_tag(pb, pc_tag);
+ }
+
+ if (ret) {
ret = avi_write_packet_internal(s, pkt);
av_packet_free(&pkt);
return ret;
--
1.7.10.4
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