avformat/avienc: Store pal8 palette

This can be made more efficient, but first and the main goal of this change is to
store it at all
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/avienc.c

@@ -646,7 +646,11 @@ static int write_skip_frames(AVFormatContext *s, int stream_index, int64_t dts)
 
 static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
 {
+    unsigned char tag[5];
     const int stream_index = pkt->stream_index;
+    const uint8_t *data    = pkt->data;
+    int size               = pkt->size;
+    AVIOContext *pb     = s->pb;
     AVCodecContext *enc = s->streams[stream_index]->codec;
     int ret;
 
@@ -667,6 +671,21 @@ static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
         if (ret < 0)
             return ret;
         if (ret) {
+            if (ret == CONTAINS_PAL) {
+                int pc_tag, i;
+                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, 0);
+                avio_wl16(pb, 0); // reserved
+                for (i = 0; i<256; i++) {
+                    uint32_t v = AV_RL32(data + size - 1024 + 4*i);
+                    avio_wb32(pb, v<<8);
+                }
+                ff_end_tag(pb, pc_tag);
+            }
             ret = avi_write_packet_internal(s, pkt);
             av_packet_free(&pkt);
             return ret;

libavformat/internal.h

@@ -560,11 +560,16 @@ void ff_format_io_close(AVFormatContext *s, AVIOContext **pb);
  */
 int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);
 
+
+#define CONTAINS_PAL 2
 /**
  * Reshuffles the lines to use the user specified stride.
  *
  * @param ppkt input and output packet
- * @return negative error code or 0 or 1, 1 indicates that ppkt needs to be freed
+ * @return negative error code or
+ *         0 if no new packet was allocated
+ *         non-zero if a new packet was allocated and ppkt has to be freed
+ *         CONTAINS_PAL if in addition to a new packet the old contained a palette
  */
 int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecContext *enc, int expected_stride);
 

libavformat/rawutils.c

@@ -29,7 +29,8 @@ int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecContext *en
     int64_t bpc = enc->bits_per_coded_sample != 15 ? enc->bits_per_coded_sample : 16;
     int min_stride = (enc->width * bpc + 7) >> 3;
     int with_pal_size = min_stride * enc->height + 1024;
-    int size = bpc == 8 && pkt->size == with_pal_size ? min_stride * enc->height : pkt->size;
+    int contains_pal = bpc == 8 && pkt->size == with_pal_size;
+    int size = contains_pal ? min_stride * enc->height : pkt->size;
     int stride = size / enc->height;
     int padding = expected_stride - FFMIN(expected_stride, stride);
     int y;
@@ -58,7 +59,7 @@ int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecContext *en
     }
 
     *ppkt = new_pkt;
-    return 1;
+    return 1 + contains_pal;
 fail:
     av_packet_free(&new_pkt);
 

libavformat/version.h

@@ -31,7 +31,7 @@
 
 #define LIBAVFORMAT_VERSION_MAJOR  57
 #define LIBAVFORMAT_VERSION_MINOR  25
-#define LIBAVFORMAT_VERSION_MICRO 101
+#define LIBAVFORMAT_VERSION_MICRO 102
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \