diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/cinepak.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/cinepak.c | 56 |
1 files changed, 38 insertions, 18 deletions
diff --git a/contrib/ffmpeg/libavcodec/cinepak.c b/contrib/ffmpeg/libavcodec/cinepak.c index e137377e5..db0519b5d 100644 --- a/contrib/ffmpeg/libavcodec/cinepak.c +++ b/contrib/ffmpeg/libavcodec/cinepak.c @@ -26,6 +26,8 @@ * by Ewald Snel <ewald@rambo.its.tudelft.nl> * For more information on the Cinepak algorithm, visit: * http://www.csse.monash.edu.au/~timf/ + * For more information on the quirky data inside Sega FILM/CPK files, visit: + * http://wiki.multimedia.cx/index.php?title=Sega_FILM */ #include <stdio.h> @@ -67,6 +69,8 @@ typedef struct CinepakContext { int palette_video; cvid_strip_t strips[MAX_STRIPS]; + int sega_film_skip_bytes; + } CinepakContext; static void cinepak_decode_codebook (cvid_codebook_t *codebook, @@ -86,7 +90,7 @@ static void cinepak_decode_codebook (cvid_codebook_t *codebook, if ((data + 4) > eod) break; - flag = BE_32 (data); + flag = AV_RB32 (data); data += 4; mask = 0x80000000; } @@ -148,7 +152,7 @@ static int cinepak_decode_vectors (CinepakContext *s, cvid_strip_t *strip, if ((data + 4) > eod) return -1; - flag = BE_32 (data); + flag = AV_RB32 (data); data += 4; mask = 0x80000000; } @@ -158,7 +162,7 @@ static int cinepak_decode_vectors (CinepakContext *s, cvid_strip_t *strip, if ((data + 4) > eod) return -1; - flag = BE_32 (data); + flag = AV_RB32 (data); data += 4; mask = 0x80000000; } @@ -274,8 +278,8 @@ static int cinepak_decode_strip (CinepakContext *s, return -1; while ((data + 4) <= eod) { - chunk_id = BE_16 (&data[0]); - chunk_size = BE_16 (&data[2]) - 4; + chunk_id = AV_RB16 (&data[0]); + chunk_size = AV_RB16 (&data[2]) - 4; if(chunk_size < 0) return -1; @@ -319,21 +323,36 @@ static int cinepak_decode (CinepakContext *s) int i, result, strip_size, frame_flags, num_strips; int y0 = 0; int encoded_buf_size; - /* if true, Cinepak data is from a Sega FILM/CPK file */ - int sega_film_data = 0; if (s->size < 10) return -1; frame_flags = s->data[0]; - num_strips = BE_16 (&s->data[8]); - encoded_buf_size = ((s->data[1] << 16) | BE_16 (&s->data[2])); - if (encoded_buf_size != s->size) - sega_film_data = 1; - if (sega_film_data) - s->data += 12; - else - s->data += 10; + num_strips = AV_RB16 (&s->data[8]); + encoded_buf_size = ((s->data[1] << 16) | AV_RB16 (&s->data[2])); + + /* if this is the first frame, check for deviant Sega FILM data */ + if (s->sega_film_skip_bytes == -1) { + if (encoded_buf_size != s->size) { + /* If the encoded frame size differs from the frame size as indicated + * by the container file, this data likely comes from a Sega FILM/CPK file. + * If the frame header is followed by the bytes FE 00 00 06 00 00 then + * this is probably one of the two known files that have 6 extra bytes + * after the frame header. Else, assume 2 extra bytes. */ + if ((s->data[10] == 0xFE) && + (s->data[11] == 0x00) && + (s->data[12] == 0x00) && + (s->data[13] == 0x06) && + (s->data[14] == 0x00) && + (s->data[15] == 0x00)) + s->sega_film_skip_bytes = 6; + else + s->sega_film_skip_bytes = 2; + } else + s->sega_film_skip_bytes = 0; + } + + s->data += 10 + s->sega_film_skip_bytes; if (num_strips > MAX_STRIPS) num_strips = MAX_STRIPS; @@ -342,13 +361,13 @@ static int cinepak_decode (CinepakContext *s) if ((s->data + 12) > eod) return -1; - s->strips[i].id = BE_16 (s->data); + s->strips[i].id = AV_RB16 (s->data); s->strips[i].y1 = y0; s->strips[i].x1 = 0; - s->strips[i].y2 = y0 + BE_16 (&s->data[8]); + s->strips[i].y2 = y0 + AV_RB16 (&s->data[8]); s->strips[i].x2 = s->avctx->width; - strip_size = BE_16 (&s->data[2]) - 12; + strip_size = AV_RB16 (&s->data[2]) - 12; s->data += 12; strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size; @@ -377,6 +396,7 @@ static int cinepak_decode_init(AVCodecContext *avctx) s->avctx = avctx; s->width = (avctx->width + 3) & ~3; s->height = (avctx->height + 3) & ~3; + s->sega_film_skip_bytes = -1; /* uninitialized state */ // check for paletted data if ((avctx->palctrl == NULL) || (avctx->bits_per_sample == 40)) { |