/* * FFV1 decoder * * Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at> * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * FF Video Codec 1 (a lossless codec) decoder */ #include "libavutil/avassert.h" #include "libavutil/pixdesc.h" #include "libavutil/crc.h" #include "libavutil/opt.h" #include "libavutil/imgutils.h" #include "libavutil/timer.h" #include "avcodec.h" #include "internal.h" #include "get_bits.h" #include "put_bits.h" #include "rangecoder.h" #include "golomb.h" #include "mathops.h" #include "ffv1.h" static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state, int is_signed) { if (get_rac(c, state + 0)) return 0; else { int i, e, a; e = 0; while (get_rac(c, state + 1 + FFMIN(e, 9))) // 1..10 e++; a = 1; for (i = e - 1; i >= 0; i--) a += a + get_rac(c, state + 22 + FFMIN(i, 9)); // 22..31 e = -(is_signed && get_rac(c, state + 11 + FFMIN(e, 10))); // 11..21 return (a ^ e) - e; } } static av_noinline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed) { return get_symbol_inline(c, state, is_signed); } static inline int get_vlc_symbol(GetBitContext *gb, VlcState *const state, int bits) { int k, i, v, ret; i = state->count; k = 0; while (i < state->error_sum) { // FIXME: optimize k++; i += i; } assert(k <= 8); v = get_sr_golomb(gb, k, 12, bits); av_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d", v, state->bias, state->error_sum, state->drift, state->count, k); #if 0 // JPEG LS if (k == 0 && 2 * state->drift <= -state->count) v ^= (-1); #else v ^= ((2 * state->drift + state->count) >> 31); #endif ret = fold(v + state->bias, bits); update_vlc_state(state, v); return ret; } static av_always_inline void decode_line(FFV1Context *s, int w, int16_t *sample[2], int plane_index, int bits) { PlaneContext *const p = &s->plane[plane_index]; RangeCoder *const c = &s->c; int x; int run_count = 0; int run_mode = 0; int run_index = s->run_index; for (x = 0; x < w; x++) { int diff, context, sign; context = get_context(p, sample[1] + x, sample[0] + x, sample[1] + x); if (context < 0) { context = -context; sign = 1; } else sign = 0; av_assert2(context < p->context_count); if (s->ac) { diff = get_symbol_inline(c, p->state[context], 1); } else { if (context == 0 && run_mode == 0) run_mode = 1; if (run_mode) { if (run_count == 0 && run_mode == 1) { if (get_bits1(&s->gb)) { run_count = 1 << ff_log2_run[run_index]; if (x + run_count <= w) run_index++; } else { if (ff_log2_run[run_index]) run_count = get_bits(&s->gb, ff_log2_run[run_index]); else run_count = 0; if (run_index) run_index--; run_mode = 2; } } run_count--; if (run_count < 0) { run_mode = 0; run_count = 0; diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits); if (diff >= 0) diff++; } else diff = 0; } else diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits); av_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n", run_count, run_index, run_mode, x, get_bits_count(&s->gb)); } if (sign) diff = -diff; sample[1][x] = (predict(sample[1] + x, sample[0] + x) + diff) & ((1 << bits) - 1); } s->run_index = run_index; } static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index) { int x, y; int16_t *sample[2]; sample[0] = s->sample_buffer + 3; sample[1] = s->sample_buffer + w + 6 + 3; s->run_index = 0; memset(s->sample_buffer, 0, 2 * (w + 6) * sizeof(*s->sample_buffer)); for (y = 0; y < h; y++) { int16_t *temp = sample[0]; // FIXME: try a normal buffer sample[0] = sample[1]; sample[1] = temp; sample[1][-1] = sample[0][0]; sample[0][w] = sample[0][w - 1]; // { START_TIMER if (s->avctx->bits_per_raw_sample <= 8) { decode_line(s, w, sample, plane_index, 8); for (x = 0; x < w; x++) src[x + stride * y] = sample[1][x]; } else { decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample); if (s->packed_at_lsb) { for (x = 0; x < w; x++) ((uint16_t *)(src + stride * y))[x] = sample[1][x]; } else { for (x = 0; x < w; x++) ((uint16_t *)(src + stride * y))[x] = sample[1][x] << (16 - s->avctx->bits_per_raw_sample); } } // STOP_TIMER("decode-line") } } } static void decode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h, int stride[3]) { int x, y, p; int16_t *sample[4][2]; int lbd = s->avctx->bits_per_raw_sample <= 8; int bits = s->avctx->bits_per_raw_sample > 0 ? s->avctx->bits_per_raw_sample : 8; int offset = 1 << bits; for (x = 0; x < 4; x++) { sample[x][0] = s->sample_buffer + x * 2 * (w + 6) + 3; sample[x][1] = s->sample_buffer + (x * 2 + 1) * (w + 6) + 3; } s->run_index = 0; memset(s->sample_buffer, 0, 8 * (w + 6) * sizeof(*s->sample_buffer)); for (y = 0; y < h; y++) { for (p = 0; p < 3 + s->transparency; p++) { int16_t *temp = sample[p][0]; //FIXME try a normal buffer sample[p][0] = sample[p][1]; sample[p][1] = temp; sample[p][1][-1] = sample[p][0][0]; sample[p][0][w] = sample[p][0][w - 1]; if (lbd) decode_line(s, w, sample[p], (p + 1) / 2, 9); else decode_line(s, w, sample[p], (p + 1) / 2, bits + 1); } for (x = 0; x < w; x++) { int g = sample[0][1][x]; int b = sample[1][1][x]; int r = sample[2][1][x]; int a = sample[3][1][x]; b -= offset; r -= offset; g -= (b + r) >> 2; b += g; r += g; if (lbd) *((uint32_t *)(src[0] + x * 4 + stride[0] * y)) = b + (g << 8) + (r << 16) + (a << 24); else { *((uint16_t *)(src[0] + x * 2 + stride[0] * y)) = b; *((uint16_t *)(src[1] + x * 2 + stride[1] * y)) = g; *((uint16_t *)(src[2] + x * 2 + stride[2] * y)) = r; } } } } static int decode_slice_header(FFV1Context *f, FFV1Context *fs) { RangeCoder *c = &fs->c; uint8_t state[CONTEXT_SIZE]; unsigned ps, i, context_count; memset(state, 128, sizeof(state)); if (fs->ac > 1) { for (i = 1; i < 256; i++) { fs->c.one_state[i] = f->state_transition[i]; fs->c.zero_state[256 - i] = 256 - fs->c.one_state[i]; } } fs->slice_x = get_symbol(c, state, 0) * f->width; fs->slice_y = get_symbol(c, state, 0) * f->height; fs->slice_width = (get_symbol(c, state, 0) + 1) * f->width + fs->slice_x; fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y; fs->slice_x /= f->num_h_slices; fs->slice_y /= f->num_v_slices; fs->slice_width = fs->slice_width / f->num_h_slices - fs->slice_x; fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y; if ((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height) return AVERROR_INVALIDDATA; if ((unsigned)fs->slice_x + (uint64_t)fs->slice_width > f->width || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height) return AVERROR_INVALIDDATA; for (i = 0; i < f->plane_count; i++) { PlaneContext *const p = &fs->plane[i]; int idx = get_symbol(c, state, 0); if (idx > (unsigned)f->quant_table_count) { av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n"); return AVERROR_INVALIDDATA; } p->quant_table_index = idx; memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table)); context_count = f->context_count[idx]; if (p->context_count < context_count) { av_freep(&p->state); av_freep(&p->vlc_state); } p->context_count = context_count; } ps = get_symbol(c, state, 0); if (ps == 1) { f->cur->interlaced_frame = 1; f->cur->top_field_first = 1; } else if (ps == 2) { f->cur->interlaced_frame = 1; f->cur->top_field_first = 0; } else if (ps == 3) { f->cur->interlaced_frame = 0; } f->cur->sample_aspect_ratio.num = get_symbol(c, state, 0); f->cur->sample_aspect_ratio.den = get_symbol(c, state, 0); if (av_image_check_sar(f->width, f->height, f->cur->sample_aspect_ratio) < 0) { av_log(f->avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n", f->cur->sample_aspect_ratio.num, f->cur->sample_aspect_ratio.den); f->cur->sample_aspect_ratio = (AVRational){ 0, 1 }; } return 0; } static int decode_slice(AVCodecContext *c, void *arg) { FFV1Context *fs = *(void **)arg; FFV1Context *f = fs->avctx->priv_data; int width, height, x, y, ret; const int ps = (av_pix_fmt_desc_get(c->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR) ? (c->bits_per_raw_sample > 8) + 1 : 4; AVFrame *const p = f->cur; if (f->version > 2) { if (decode_slice_header(f, fs) < 0) { fs->slice_damaged = 1; return AVERROR_INVALIDDATA; } } if ((ret = ffv1_init_slice_state(f, fs)) < 0) return ret; if (f->cur->key_frame) ffv1_clear_slice_state(f, fs); width = fs->slice_width; height = fs->slice_height; x = fs->slice_x; y = fs->slice_y; if (!fs->ac) { if (f->version == 3 && f->minor_version > 1 || f->version > 3) get_rac(&fs->c, (uint8_t[]) { 129 }); fs->ac_byte_count = f->version > 2 || (!x && !y) ? fs->c.bytestream - fs->c.bytestream_start - 1 : 0; init_get_bits(&fs->gb, fs->c.bytestream_start + fs->ac_byte_count, (fs->c.bytestream_end - fs->c.bytestream_start - fs->ac_byte_count) * 8); } av_assert1(width && height); if (f->colorspace == 0) { const int chroma_width = -((-width) >> f->chroma_h_shift); const int chroma_height = -((-height) >> f->chroma_v_shift); const int cx = x >> f->chroma_h_shift; const int cy = y >> f->chroma_v_shift; decode_plane(fs, p->data[0] + ps * x + y * p->linesize[0], width, height, p->linesize[0], 0); if (f->chroma_planes) { decode_plane(fs, p->data[1] + ps * cx + cy * p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1); decode_plane(fs, p->data[2] + ps * cx + cy * p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1); } if (fs->transparency) decode_plane(fs, p->data[3] + ps * x + y * p->linesize[3], width, height, p->linesize[3], 2); } else { uint8_t *planes[3] = { p->data[0] + ps * x + y * p->linesize[0], p->data[1] + ps * x + y * p->linesize[1], p->data[2] + ps * x + y * p->linesize[2] }; decode_rgb_frame(fs, planes, width, height, p->linesize); } if (fs->ac && f->version > 2) { int v; get_rac(&fs->c, (uint8_t[]) { 129 }); v = fs->c.bytestream_end - fs->c.bytestream - 2 - 5 * f->ec; if (v) { av_log(f->avctx, AV_LOG_ERROR, "bytestream end mismatching by %d\n", v); fs->slice_damaged = 1; } } emms_c(); return 0; } static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale) { int v; int i = 0; uint8_t state[CONTEXT_SIZE]; memset(state, 128, sizeof(state)); for (v = 0; i < 128; v++) { unsigned len = get_symbol(c, state, 0) + 1; if (len > 128 - i) return -1; while (len--) { quant_table[i] = scale * v; i++; } } for (i = 1; i < 128; i++) quant_table[256 - i] = -quant_table[i]; quant_table[128] = -quant_table[127]; return 2 * v - 1; } static int read_quant_tables(RangeCoder *c, int16_t quant_table[MAX_CONTEXT_INPUTS][256]) { int i; int context_count = 1; for (i = 0; i < 5; i++) { context_count *= read_quant_table(c, quant_table[i], context_count); if (context_count > 32768U) { return -1; } } return (context_count + 1) / 2; } static int read_extra_header(FFV1Context *f) { RangeCoder *const c = &f->c; uint8_t state[CONTEXT_SIZE]; int i, j, k, ret; uint8_t state2[32][CONTEXT_SIZE]; memset(state2, 128, sizeof(state2)); memset(state, 128, sizeof(state)); ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size); ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8); f->version = get_symbol(c, state, 0); if (f->version > 2) { c->bytestream_end -= 4; f->minor_version = get_symbol(c, state, 0); } f->ac = f->avctx->coder_type = get_symbol(c, state, 0); if (f->ac > 1) { for (i = 1; i < 256; i++) f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i]; } f->colorspace = get_symbol(c, state, 0); //YUV cs type f->avctx->bits_per_raw_sample = get_symbol(c, state, 0); f->chroma_planes = get_rac(c, state); f->chroma_h_shift = get_symbol(c, state, 0); f->chroma_v_shift = get_symbol(c, state, 0); f->transparency = get_rac(c, state); f->plane_count = 2 + f->transparency; f->num_h_slices = 1 + get_symbol(c, state, 0); f->num_v_slices = 1 + get_symbol(c, state, 0); if (f->num_h_slices > (unsigned)f->width || f->num_v_slices > (unsigned)f->height) { av_log(f->avctx, AV_LOG_ERROR, "too many slices\n"); return AVERROR_INVALIDDATA; } f->quant_table_count = get_symbol(c, state, 0); if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES) return AVERROR_INVALIDDATA; for (i = 0; i < f->quant_table_count; i++) { f->context_count[i] = read_quant_tables(c, f->quant_tables[i]); if (f->context_count[i] < 0) { av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n"); return AVERROR_INVALIDDATA; } } if ((ret = ffv1_allocate_initial_states(f)) < 0) return ret; for (i = 0; i < f->quant_table_count; i++) if (get_rac(c, state)) { for (j = 0; j < f->context_count[i]; j++) for (k = 0; k < CONTEXT_SIZE; k++) { int pred = j ? f->initial_states[i][j - 1][k] : 128; f->initial_states[i][j][k] = (pred + get_symbol(c, state2[k], 1)) & 0xFF; } } if (f->version > 2) { f->ec = get_symbol(c, state, 0); } if (f->version > 2) { unsigned v; v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, f->avctx->extradata, f->avctx->extradata_size); if (v) { av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", v); return AVERROR_INVALIDDATA; } } return 0; } static int read_header(FFV1Context *f) { uint8_t state[CONTEXT_SIZE]; int i, j, context_count = -1; RangeCoder *const c = &f->slice_context[0]->c; memset(state, 128, sizeof(state)); if (f->version < 2) { unsigned v = get_symbol(c, state, 0); if (v > 1) { av_log(f->avctx, AV_LOG_ERROR, "invalid version %d in version 1 header\n", v); return AVERROR_INVALIDDATA; } f->version = v; f->ac = f->avctx->coder_type = get_symbol(c, state, 0); if (f->ac > 1) { for (i = 1; i < 256; i++) f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i]; } f->colorspace = get_symbol(c, state, 0); //YUV cs type if (f->version > 0) f->avctx->bits_per_raw_sample = get_symbol(c, state, 0); f->chroma_planes = get_rac(c, state); f->chroma_h_shift = get_symbol(c, state, 0); f->chroma_v_shift = get_symbol(c, state, 0); f->transparency = get_rac(c, state); f->plane_count = 2 + f->transparency; } if (f->colorspace == 0) { if (!f->transparency && !f->chroma_planes) { if (f->avctx->bits_per_raw_sample <= 8) f->avctx->pix_fmt = AV_PIX_FMT_GRAY8; else f->avctx->pix_fmt = AV_PIX_FMT_GRAY16; } else if (f->avctx->bits_per_raw_sample <= 8 && !f->transparency) { switch (16 * f->chroma_h_shift + f->chroma_v_shift) { case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P; break; case 0x01: f->avctx->pix_fmt = AV_PIX_FMT_YUV440P; break; case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P; break; case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P; break; case 0x20: f->avctx->pix_fmt = AV_PIX_FMT_YUV411P; break; case 0x22: f->avctx->pix_fmt = AV_PIX_FMT_YUV410P; break; default: av_log(f->avctx, AV_LOG_ERROR, "format not supported\n"); return AVERROR(ENOSYS); } } else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency) { switch (16 * f->chroma_h_shift + f->chroma_v_shift) { case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P; break; case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P; break; case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P; break; default: av_log(f->avctx, AV_LOG_ERROR, "format not supported\n"); return AVERROR(ENOSYS); } } else if (f->avctx->bits_per_raw_sample == 9) { f->packed_at_lsb = 1; switch (16 * f->chroma_h_shift + f->chroma_v_shift) { case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P9; break; case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P9; break; case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P9; break; default: av_log(f->avctx, AV_LOG_ERROR, "format not supported\n"); return AVERROR(ENOSYS); } } else if (f->avctx->bits_per_raw_sample == 10) { f->packed_at_lsb = 1; switch (16 * f->chroma_h_shift + f->chroma_v_shift) { case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P10; break; case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P10; break; case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P10; break; default: av_log(f->avctx, AV_LOG_ERROR, "format not supported\n"); return AVERROR(ENOSYS); } } else { switch (16 * f->chroma_h_shift + f->chroma_v_shift) { case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P16; break; case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P16; break; case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P16; break; default: av_log(f->avctx, AV_LOG_ERROR, "format not supported\n"); return AVERROR(ENOSYS); } } } else if (f->colorspace == 1) { if (f->chroma_h_shift || f->chroma_v_shift) { av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n"); return AVERROR(ENOSYS); } switch (f->avctx->bits_per_raw_sample) { case 0: case 8: f->avctx->pix_fmt = AV_PIX_FMT_RGB32; break; case 9: f->avctx->pix_fmt = AV_PIX_FMT_GBRP9; break; case 10: f->avctx->pix_fmt = AV_PIX_FMT_GBRP10; break; default: av_log(f->avctx, AV_LOG_ERROR, "bit depth %d not supported\n", f->avctx->bits_per_raw_sample); return AVERROR(ENOSYS); } } else { av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n"); return AVERROR(ENOSYS); } av_dlog(f->avctx, "%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift, f->avctx->pix_fmt); if (f->version < 2) { context_count = read_quant_tables(c, f->quant_table); if (context_count < 0) { av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n"); return AVERROR_INVALIDDATA; } } else if (f->version < 3) { f->slice_count = get_symbol(c, state, 0); } else { const uint8_t *p = c->bytestream_end; for (f->slice_count = 0; f->slice_count < MAX_SLICES && 3 < p - c->bytestream_start; f->slice_count++) { int trailer = 3 + 5 * !!f->ec; int size = AV_RB24(p - trailer); if (size + trailer > p - c->bytestream_start) break; p -= size + trailer; } } if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0) { av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid\n", f->slice_count); return AVERROR_INVALIDDATA; } for (j = 0; j < f->slice_count; j++) { FFV1Context *fs = f->slice_context[j]; fs->ac = f->ac; fs->packed_at_lsb = f->packed_at_lsb; fs->slice_damaged = 0; if (f->version == 2) { fs->slice_x = get_symbol(c, state, 0) * f->width; fs->slice_y = get_symbol(c, state, 0) * f->height; fs->slice_width = (get_symbol(c, state, 0) + 1) * f->width + fs->slice_x; fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y; fs->slice_x /= f->num_h_slices; fs->slice_y /= f->num_v_slices; fs->slice_width = fs->slice_width / f->num_h_slices - fs->slice_x; fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y; if ((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height) return AVERROR_INVALIDDATA; if ((unsigned)fs->slice_x + (uint64_t)fs->slice_width > f->width || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height) return AVERROR_INVALIDDATA; } for (i = 0; i < f->plane_count; i++) { PlaneContext *const p = &fs->plane[i]; if (f->version == 2) { int idx = get_symbol(c, state, 0); if (idx > (unsigned)f->quant_table_count) { av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n"); return AVERROR_INVALIDDATA; } p->quant_table_index = idx; memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table)); context_count = f->context_count[idx]; } else { memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table)); } if (f->version <= 2) { av_assert0(context_count >= 0); if (p->context_count < context_count) { av_freep(&p->state); av_freep(&p->vlc_state); } p->context_count = context_count; } } } return 0; } static av_cold int ffv1_decode_init(AVCodecContext *avctx) { FFV1Context *f = avctx->priv_data; int ret; ffv1_common_init(avctx); f->last_picture = av_frame_alloc(); if (!f->last_picture) return AVERROR(ENOMEM); if (avctx->extradata && (ret = read_extra_header(f)) < 0) return ret; if ((ret = ffv1_init_slice_contexts(f)) < 0) return ret; return 0; } static int ffv1_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; FFV1Context *f = avctx->priv_data; RangeCoder *const c = &f->slice_context[0]->c; int i, ret; uint8_t keystate = 128; const uint8_t *buf_p; AVFrame *const p = data; f->cur = p; ff_init_range_decoder(c, buf, buf_size); ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8); p->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P if (get_rac(c, &keystate)) { p->key_frame = 1; f->key_frame_ok = 0; if ((ret = read_header(f)) < 0) return ret; f->key_frame_ok = 1; } else { if (!f->key_frame_ok) { av_log(avctx, AV_LOG_ERROR, "Cannot decode non-keyframe without valid keyframe\n"); return AVERROR_INVALIDDATA; } p->key_frame = 0; } if ((ret = ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF)) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; } if (avctx->debug & FF_DEBUG_PICT_INFO) av_log(avctx, AV_LOG_DEBUG, "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n", f->version, p->key_frame, f->ac, f->ec, f->slice_count, f->avctx->bits_per_raw_sample); buf_p = buf + buf_size; for (i = f->slice_count - 1; i >= 0; i--) { FFV1Context *fs = f->slice_context[i]; int trailer = 3 + 5 * !!f->ec; int v; if (i || f->version > 2) v = AV_RB24(buf_p - trailer) + trailer; else v = buf_p - c->bytestream_start; if (buf_p - c->bytestream_start < v) { av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n"); return AVERROR_INVALIDDATA; } buf_p -= v; if (f->ec) { unsigned crc = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, buf_p, v); if (crc) { av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", crc); fs->slice_damaged = 1; } } if (i) { ff_init_range_decoder(&fs->c, buf_p, v); } else fs->c.bytestream_end = (uint8_t *)(buf_p + v); fs->cur = p; } avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void *)); for (i = f->slice_count - 1; i >= 0; i--) { FFV1Context *fs = f->slice_context[i]; int j; if (fs->slice_damaged && f->last_picture->data[0]) { const uint8_t *src[4]; uint8_t *dst[4]; for (j = 0; j < 4; j++) { int sh = (j == 1 || j == 2) ? f->chroma_h_shift : 0; int sv = (j == 1 || j == 2) ? f->chroma_v_shift : 0; dst[j] = p->data[j] + p->linesize[j] * (fs->slice_y >> sv) + (fs->slice_x >> sh); src[j] = f->last_picture->data[j] + f->last_picture->linesize[j] * (fs->slice_y >> sv) + (fs->slice_x >> sh); } av_image_copy(dst, p->linesize, (const uint8_t **)src, f->last_picture->linesize, avctx->pix_fmt, fs->slice_width, fs->slice_height); } } f->picture_number++; av_frame_unref(f->last_picture); if ((ret = av_frame_ref(f->last_picture, p)) < 0) return ret; f->cur = NULL; *got_frame = 1; return buf_size; } static av_cold int ffv1_decode_close(AVCodecContext *avctx) { FFV1Context *s = avctx->priv_data;; av_frame_free(&s->last_picture); ffv1_close(avctx); return 0; } AVCodec ff_ffv1_decoder = { .name = "ffv1", .long_name = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_FFV1, .priv_data_size = sizeof(FFV1Context), .init = ffv1_decode_init, .close = ffv1_decode_close, .decode = ffv1_decode_frame, .capabilities = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ | CODEC_CAP_SLICE_THREADS, };