| /* |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "cbs.h" |
| #include "cbs_internal.h" |
| #include "cbs_jpeg.h" |
| |
| |
| #define HEADER(name) do { \ |
| ff_cbs_trace_header(ctx, name); \ |
| } while (0) |
| |
| #define CHECK(call) do { \ |
| err = (call); \ |
| if (err < 0) \ |
| return err; \ |
| } while (0) |
| |
| #define SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL) |
| |
| #define u(width, name, range_min, range_max) \ |
| xu(width, name, range_min, range_max, 0, ) |
| #define us(width, name, sub, range_min, range_max) \ |
| xu(width, name, range_min, range_max, 1, sub) |
| |
| |
| #define READ |
| #define READWRITE read |
| #define RWContext GetBitContext |
| #define FUNC(name) cbs_jpeg_read_ ## name |
| |
| #define xu(width, name, range_min, range_max, subs, ...) do { \ |
| uint32_t value; \ |
| CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \ |
| SUBSCRIPTS(subs, __VA_ARGS__), \ |
| &value, range_min, range_max)); \ |
| current->name = value; \ |
| } while (0) |
| |
| #include "cbs_jpeg_syntax_template.c" |
| |
| #undef READ |
| #undef READWRITE |
| #undef RWContext |
| #undef FUNC |
| #undef xu |
| |
| #define WRITE |
| #define READWRITE write |
| #define RWContext PutBitContext |
| #define FUNC(name) cbs_jpeg_write_ ## name |
| |
| #define xu(width, name, range_min, range_max, subs, ...) do { \ |
| uint32_t value = current->name; \ |
| CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \ |
| SUBSCRIPTS(subs, __VA_ARGS__), \ |
| value, range_min, range_max)); \ |
| } while (0) |
| |
| |
| #include "cbs_jpeg_syntax_template.c" |
| |
| #undef WRITE |
| #undef READWRITE |
| #undef RWContext |
| #undef FUNC |
| #undef xu |
| |
| |
| static void cbs_jpeg_free_application_data(void *opaque, uint8_t *content) |
| { |
| JPEGRawApplicationData *ad = (JPEGRawApplicationData*)content; |
| av_buffer_unref(&ad->Ap_ref); |
| av_freep(&content); |
| } |
| |
| static void cbs_jpeg_free_comment(void *opaque, uint8_t *content) |
| { |
| JPEGRawComment *comment = (JPEGRawComment*)content; |
| av_buffer_unref(&comment->Cm_ref); |
| av_freep(&content); |
| } |
| |
| static void cbs_jpeg_free_scan(void *opaque, uint8_t *content) |
| { |
| JPEGRawScan *scan = (JPEGRawScan*)content; |
| av_buffer_unref(&scan->data_ref); |
| av_freep(&content); |
| } |
| |
| static int cbs_jpeg_split_fragment(CodedBitstreamContext *ctx, |
| CodedBitstreamFragment *frag, |
| int header) |
| { |
| AVBufferRef *data_ref; |
| uint8_t *data; |
| size_t data_size; |
| int unit, start, end, marker, next_start, next_marker; |
| int err, i, j, length; |
| |
| if (frag->data_size < 4) { |
| // Definitely too short to be meaningful. |
| return AVERROR_INVALIDDATA; |
| } |
| |
| for (i = 0; i + 1 < frag->data_size && frag->data[i] != 0xff; i++); |
| if (i > 0) { |
| av_log(ctx->log_ctx, AV_LOG_WARNING, "Discarding %d bytes at " |
| "beginning of image.\n", i); |
| } |
| for (++i; i + 1 < frag->data_size && frag->data[i] == 0xff; i++); |
| if (i + 1 >= frag->data_size && frag->data[i]) { |
| av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid JPEG image: " |
| "no SOI marker found.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| marker = frag->data[i]; |
| if (marker != JPEG_MARKER_SOI) { |
| av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid JPEG image: first " |
| "marker is %02x, should be SOI.\n", marker); |
| return AVERROR_INVALIDDATA; |
| } |
| for (++i; i + 1 < frag->data_size && frag->data[i] == 0xff; i++); |
| if (i + 1 >= frag->data_size) { |
| av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid JPEG image: " |
| "no image content found.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| marker = frag->data[i]; |
| start = i + 1; |
| |
| for (unit = 0;; unit++) { |
| if (marker == JPEG_MARKER_EOI) { |
| break; |
| } else if (marker == JPEG_MARKER_SOS) { |
| next_marker = -1; |
| end = start; |
| for (i = start; i + 1 < frag->data_size; i++) { |
| if (frag->data[i] != 0xff) |
| continue; |
| end = i; |
| for (++i; i + 1 < frag->data_size && |
| frag->data[i] == 0xff; i++); |
| if (i + 1 < frag->data_size) { |
| if (frag->data[i] == 0x00) |
| continue; |
| next_marker = frag->data[i]; |
| next_start = i + 1; |
| } |
| break; |
| } |
| } else { |
| i = start; |
| if (i + 2 > frag->data_size) { |
| av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid JPEG image: " |
| "truncated at %02x marker.\n", marker); |
| return AVERROR_INVALIDDATA; |
| } |
| length = AV_RB16(frag->data + i); |
| if (i + length > frag->data_size) { |
| av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid JPEG image: " |
| "truncated at %02x marker segment.\n", marker); |
| return AVERROR_INVALIDDATA; |
| } |
| end = start + length; |
| |
| i = end; |
| if (frag->data[i] != 0xff) { |
| next_marker = -1; |
| } else { |
| for (++i; i + 1 < frag->data_size && |
| frag->data[i] == 0xff; i++); |
| if (i + 1 >= frag->data_size) { |
| next_marker = -1; |
| } else { |
| next_marker = frag->data[i]; |
| next_start = i + 1; |
| } |
| } |
| } |
| |
| if (marker == JPEG_MARKER_SOS) { |
| length = AV_RB16(frag->data + start); |
| |
| if (length > end - start) |
| return AVERROR_INVALIDDATA; |
| |
| data_ref = NULL; |
| data = av_malloc(end - start + |
| AV_INPUT_BUFFER_PADDING_SIZE); |
| if (!data) |
| return AVERROR(ENOMEM); |
| |
| memcpy(data, frag->data + start, length); |
| for (i = start + length, j = length; i < end; i++, j++) { |
| if (frag->data[i] == 0xff) { |
| while (frag->data[i] == 0xff) |
| ++i; |
| data[j] = 0xff; |
| } else { |
| data[j] = frag->data[i]; |
| } |
| } |
| data_size = j; |
| |
| memset(data + data_size, 0, AV_INPUT_BUFFER_PADDING_SIZE); |
| |
| } else { |
| data = frag->data + start; |
| data_size = end - start; |
| data_ref = frag->data_ref; |
| } |
| |
| err = ff_cbs_insert_unit_data(frag, unit, marker, |
| data, data_size, data_ref); |
| if (err < 0) |
| return err; |
| |
| if (next_marker == -1) |
| break; |
| marker = next_marker; |
| start = next_start; |
| } |
| |
| return 0; |
| } |
| |
| static int cbs_jpeg_read_unit(CodedBitstreamContext *ctx, |
| CodedBitstreamUnit *unit) |
| { |
| GetBitContext gbc; |
| int err; |
| |
| err = init_get_bits(&gbc, unit->data, 8 * unit->data_size); |
| if (err < 0) |
| return err; |
| |
| if (unit->type >= JPEG_MARKER_SOF0 && |
| unit->type <= JPEG_MARKER_SOF3) { |
| err = ff_cbs_alloc_unit_content(unit, |
| sizeof(JPEGRawFrameHeader), |
| NULL); |
| if (err < 0) |
| return err; |
| |
| err = cbs_jpeg_read_frame_header(ctx, &gbc, unit->content); |
| if (err < 0) |
| return err; |
| |
| } else if (unit->type >= JPEG_MARKER_APPN && |
| unit->type <= JPEG_MARKER_APPN + 15) { |
| err = ff_cbs_alloc_unit_content(unit, |
| sizeof(JPEGRawApplicationData), |
| &cbs_jpeg_free_application_data); |
| if (err < 0) |
| return err; |
| |
| err = cbs_jpeg_read_application_data(ctx, &gbc, unit->content); |
| if (err < 0) |
| return err; |
| |
| } else if (unit->type == JPEG_MARKER_SOS) { |
| JPEGRawScan *scan; |
| int pos; |
| |
| err = ff_cbs_alloc_unit_content(unit, |
| sizeof(JPEGRawScan), |
| &cbs_jpeg_free_scan); |
| if (err < 0) |
| return err; |
| scan = unit->content; |
| |
| err = cbs_jpeg_read_scan_header(ctx, &gbc, &scan->header); |
| if (err < 0) |
| return err; |
| |
| pos = get_bits_count(&gbc); |
| av_assert0(pos % 8 == 0); |
| if (pos > 0) { |
| scan->data_size = unit->data_size - pos / 8; |
| scan->data_ref = av_buffer_ref(unit->data_ref); |
| if (!scan->data_ref) |
| return AVERROR(ENOMEM); |
| scan->data = unit->data + pos / 8; |
| } |
| |
| } else { |
| switch (unit->type) { |
| #define SEGMENT(marker, type, func, free) \ |
| case JPEG_MARKER_ ## marker: \ |
| { \ |
| err = ff_cbs_alloc_unit_content(unit, \ |
| sizeof(type), free); \ |
| if (err < 0) \ |
| return err; \ |
| err = cbs_jpeg_read_ ## func(ctx, &gbc, unit->content); \ |
| if (err < 0) \ |
| return err; \ |
| } \ |
| break |
| SEGMENT(DQT, JPEGRawQuantisationTableSpecification, dqt, NULL); |
| SEGMENT(DHT, JPEGRawHuffmanTableSpecification, dht, NULL); |
| SEGMENT(COM, JPEGRawComment, comment, &cbs_jpeg_free_comment); |
| #undef SEGMENT |
| default: |
| return AVERROR(ENOSYS); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int cbs_jpeg_write_scan(CodedBitstreamContext *ctx, |
| CodedBitstreamUnit *unit, |
| PutBitContext *pbc) |
| { |
| JPEGRawScan *scan = unit->content; |
| int err; |
| |
| err = cbs_jpeg_write_scan_header(ctx, pbc, &scan->header); |
| if (err < 0) |
| return err; |
| |
| if (scan->data) { |
| if (scan->data_size * 8 > put_bits_left(pbc)) |
| return AVERROR(ENOSPC); |
| |
| av_assert0(put_bits_count(pbc) % 8 == 0); |
| |
| flush_put_bits(pbc); |
| |
| memcpy(put_bits_ptr(pbc), scan->data, scan->data_size); |
| skip_put_bytes(pbc, scan->data_size); |
| } |
| |
| return 0; |
| } |
| |
| static int cbs_jpeg_write_segment(CodedBitstreamContext *ctx, |
| CodedBitstreamUnit *unit, |
| PutBitContext *pbc) |
| { |
| int err; |
| |
| if (unit->type >= JPEG_MARKER_SOF0 && |
| unit->type <= JPEG_MARKER_SOF3) { |
| err = cbs_jpeg_write_frame_header(ctx, pbc, unit->content); |
| } else if (unit->type >= JPEG_MARKER_APPN && |
| unit->type <= JPEG_MARKER_APPN + 15) { |
| err = cbs_jpeg_write_application_data(ctx, pbc, unit->content); |
| } else { |
| switch (unit->type) { |
| #define SEGMENT(marker, func) \ |
| case JPEG_MARKER_ ## marker: \ |
| err = cbs_jpeg_write_ ## func(ctx, pbc, unit->content); \ |
| break; |
| SEGMENT(DQT, dqt); |
| SEGMENT(DHT, dht); |
| SEGMENT(COM, comment); |
| default: |
| return AVERROR_PATCHWELCOME; |
| } |
| } |
| |
| return err; |
| } |
| |
| static int cbs_jpeg_write_unit(CodedBitstreamContext *ctx, |
| CodedBitstreamUnit *unit, |
| PutBitContext *pbc) |
| { |
| if (unit->type == JPEG_MARKER_SOS) |
| return cbs_jpeg_write_scan (ctx, unit, pbc); |
| else |
| return cbs_jpeg_write_segment(ctx, unit, pbc); |
| } |
| |
| static int cbs_jpeg_assemble_fragment(CodedBitstreamContext *ctx, |
| CodedBitstreamFragment *frag) |
| { |
| const CodedBitstreamUnit *unit; |
| uint8_t *data; |
| size_t size, dp, sp; |
| int i; |
| |
| size = 4; // SOI + EOI. |
| for (i = 0; i < frag->nb_units; i++) { |
| unit = &frag->units[i]; |
| size += 2 + unit->data_size; |
| if (unit->type == JPEG_MARKER_SOS) { |
| for (sp = 0; sp < unit->data_size; sp++) { |
| if (unit->data[sp] == 0xff) |
| ++size; |
| } |
| } |
| } |
| |
| frag->data_ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE); |
| if (!frag->data_ref) |
| return AVERROR(ENOMEM); |
| data = frag->data_ref->data; |
| |
| dp = 0; |
| |
| data[dp++] = 0xff; |
| data[dp++] = JPEG_MARKER_SOI; |
| |
| for (i = 0; i < frag->nb_units; i++) { |
| unit = &frag->units[i]; |
| |
| data[dp++] = 0xff; |
| data[dp++] = unit->type; |
| |
| if (unit->type != JPEG_MARKER_SOS) { |
| memcpy(data + dp, unit->data, unit->data_size); |
| dp += unit->data_size; |
| } else { |
| sp = AV_RB16(unit->data); |
| av_assert0(sp <= unit->data_size); |
| memcpy(data + dp, unit->data, sp); |
| dp += sp; |
| |
| for (; sp < unit->data_size; sp++) { |
| if (unit->data[sp] == 0xff) { |
| data[dp++] = 0xff; |
| data[dp++] = 0x00; |
| } else { |
| data[dp++] = unit->data[sp]; |
| } |
| } |
| } |
| } |
| |
| data[dp++] = 0xff; |
| data[dp++] = JPEG_MARKER_EOI; |
| |
| av_assert0(dp == size); |
| |
| memset(data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE); |
| frag->data = data; |
| frag->data_size = size; |
| |
| return 0; |
| } |
| |
| const CodedBitstreamType ff_cbs_type_jpeg = { |
| .codec_id = AV_CODEC_ID_MJPEG, |
| |
| .split_fragment = &cbs_jpeg_split_fragment, |
| .read_unit = &cbs_jpeg_read_unit, |
| .write_unit = &cbs_jpeg_write_unit, |
| .assemble_fragment = &cbs_jpeg_assemble_fragment, |
| }; |