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deploy palette control API

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Originally committed as revision 2266 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Mike Melanson 2003-09-12 03:48:14 +00:00
parent 50f52fcdc3
commit ba118447d5
3 changed files with 30 additions and 18 deletions
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19
libavcodec/avcodec.h
View File

@ -1305,6 +1305,25 @@ typedef struct AVPicture {
int linesize[4]; ///< number of bytes per line
} AVPicture;
/**
* AVPaletteControl
* This structure defines a method for communicating palette changes
* between and demuxer and a decoder.
*/
typedef struct AVPaletteControl {
/* demuxer sets this to 1 to indicate the palette has changed;
* decoder resets to 0 */
int palette_changed;
/* 256 3-byte RGB palette entries; the components should be
* formatted in the buffer as "RGBRGB..." and should be scaled to
* 8 bits if they originally represented 6-bit VGA palette
* components */
unsigned char palette[256 * 3];
} AVPaletteControl;
extern AVCodec ac3_encoder;
extern AVCodec mp2_encoder;
extern AVCodec mp3lame_encoder;

12
libavcodec/xan.c
View File

@ -115,9 +115,9 @@ static int xan_decode_init(AVCodecContext *avctx)
s->avctx = avctx;
if ((avctx->codec->id == CODEC_ID_XAN_WC3) &&
(s->avctx->extradata_size != PALETTE_CONTROL_SIZE)) {
(s->avctx->extradata_size != sizeof(AVPaletteControl))) {
printf (" WC3 Xan video: expected extradata_size of %d\n",
PALETTE_CONTROL_SIZE);
sizeof(AVPaletteControl));
return -1;
}
@ -809,13 +809,13 @@ static int xan_decode_frame(AVCodecContext *avctx,
uint8_t *buf, int buf_size)
{
XanContext *s = avctx->priv_data;
unsigned char *palette_control = avctx->extradata;
AVPaletteControl *palette_control = (AVPaletteControl *)avctx->extradata;
int keyframe = 0;
if (palette_control[0]) {
if (palette_control->palette_changed) {
/* load the new palette and reset the palette control */
xan_wc3_build_palette(s, &palette_control[1]);
palette_control[0] = 0;
xan_wc3_build_palette(s, palette_control->palette);
palette_control->palette_changed = 0;
keyframe = 1;
}

17
libavformat/wc3movie.c
View File

@ -74,9 +74,6 @@
#define PALETTE_SIZE (256 * 3)
#define PALETTE_COUNT 256
/* palette is 3 bytes per entry plus 1 byte at the front to indicate to the
* decoder if the palette has changed */
#define PALETTE_CONTROL_SIZE ((PALETTE_COUNT * 3) + 1)
typedef struct Wc3DemuxContext {
int width;
@ -87,8 +84,7 @@ typedef struct Wc3DemuxContext {
int video_stream_index;
int audio_stream_index;
/* save a reference to extradata */
unsigned char *palette_control;
AVPaletteControl palette_control;
} Wc3DemuxContext;
@ -163,7 +159,6 @@ static int wc3_read_header(AVFormatContext *s,
wc3->palette_count = 0;
wc3->pts = 0;
wc3->video_stream_index = wc3->audio_stream_index = 0;
wc3->palette_control = av_mallocz(PALETTE_CONTROL_SIZE);;
/* skip the first 3 32-bit numbers */
url_fseek(pb, 12, SEEK_CUR);
@ -263,8 +258,8 @@ static int wc3_read_header(AVFormatContext *s,
st->codec.height = wc3->height;
/* palette considerations */
st->codec.extradata_size = PALETTE_CONTROL_SIZE;
st->codec.extradata = wc3->palette_control;
st->codec.extradata_size = sizeof(AVPaletteControl);
st->codec.extradata = &wc3->palette_control;
st = av_new_stream(s, 0);
if (!st)
@ -324,11 +319,10 @@ static int wc3_read_packet(AVFormatContext *s,
palette_number = LE_32(&preamble[0]);
if (palette_number >= wc3->palette_count)
return AVERROR_INVALIDDATA;
memcpy(wc3->palette_control + 1,
memcpy(wc3->palette_control.palette,
&wc3->palettes[palette_number * PALETTE_COUNT * 3],
PALETTE_COUNT * 3);
/* indicate a palette change */
wc3->palette_control[0] = 1;
wc3->palette_control.palette_changed = 1;
break;
case VGA__TAG:
@ -396,7 +390,6 @@ static int wc3_read_close(AVFormatContext *s)
Wc3DemuxContext *wc3 = (Wc3DemuxContext *)s->priv_data;
av_free(wc3->palettes);
av_free(wc3->palette_control);
return 0;
}